Atomic Nucleus: The mass number of an atom is equal to the number of what particles in the nucleus?
A. protons
B. neutrons
C. nucleons
D. electrons
E. positrons
Answer: C
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Each y-direction force on frame ABCDEF below acts at the center of the bar segment to which it is applied. Support B is restrained against translation in the y and z directions only, and support C is restrained in the z direc- tion only. Support D is a pin support. Equilibrium of the frame requires that reaction force Cz is (in newtons):
(A) 80.8 N
(B) 67.7 N
(C) 14.8 N
(D) 92.2 N
The nucleus, or main solid body, of a comet has a typical size of
A) a few centimeters. B) a few meters. C) a few kilometers. D) a few hundred kilometers. E) a few thousand kilometers.
Transits of multiple planet systems can be analyzed to infer planetary masses
Indicate whether the statement is true or false
Three identical 50-kg masses are held at the corners of an equilateral triangle, 30 cm on each side
If one of the masses is released, what is its initial acceleration, if the only forces acting on it are the gravitational forces due to the other two masses? A) 3.7 × 10-8 m/s2 B) 2.5 × 10-8 m/s2 C) 1.9 × 10-8 m/s2 D) 4.2 × 10-8 m/s2 E) 6.4 × 10-8 m/s2